Moisture proof electrical cable

Abstract

An insulated cable core is provided with a shield made of individual wires which are embedded in a first plastically deformable jacket which carries a water vapor impermeable sleeve made of wrapped or folded metal or metallized foil or ribbon whose adjoining edges are sealed. This sleeve carries a second plastically deformable jacket to be embedded in-between two such jackets. The usual protective covering is provided around the outer deformable jacket.

I claim: 
     
       1. Electrical cable for medium and high voltages, and including a conductor core with insulating jacket covered by an electrically conductive layer, further comprising: a shield made of metallic, elongated elements such as ribbons or wires on the said layer;   a first plastically deformable jacket on the layer and sealingly embedding said ribbons or wires of said shield;   a water-vapor-impermeable sleeve on the first jacket and being comprised of a helically coiled metal or metallized ribbon having adjoining edges sealingly interconnected, the sleeve being sealed by the first jacket;   a second, plastically deformable, water-proofing jacket on the sleeve and sealing the sleeve from its outside, the sleeve being sealingly embedded by and in between the first and second jackets; and   protective cover means on the second jacket.   
     
     
       2. Cable as in claim 1, at least one of the first and second jackets being electrically conductive. 
     
     
       3. Cable as in claim 1, said plastic jackets including at least one of the following: a bituminous substance, chalk, carbon black, and graphite. 
     
     
       4. Cable as in claim 1, 2 or 3, said first and second jackets including methacrylicacidester. 
     
     
       5. Cable as in claim 1, the second jacket including a plasticizer. 
     
     
       6. Cable as in claim 1, 2, or 3, said first and second jackets including polyisobutylene. 
     
     
       7. Cable as in claim 1 or 5, the first jacket including voltage-stabilizing additives.